如果我制作了一个不实现Serializable的Composite-id类,例如:
@Entity @Table(name = "board") public class Board { @Id @Column(name = "keyword_news_id") private int id; @Id @Column(name = "board_no") private int boardNo; ....
发生错误,例如:
Caused by: org.hibernate.MappingException: composite-id class must implement Serializable: com.estinternet.news.domain.IssueNewsBoard at org.hibernate.mapping.RootClass.checkCompositeIdentifier(RootClass.java:263) at org.hibernate.mapping.RootClass.validate(RootClass.java:244) at org.hibernate.cfg.Configuration.validate(Configuration.java:1362) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1865) at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:860) at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:779) at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:211) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1477) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1417)
hibernate实体类不必是可序列化的。那么,为什么Composite- id类必须实现Serializable?我读了这个主题,但是没有给我足够的信息。
会话对象需要可序列化,因此它引用的所有对象也必须可序列化。id用作索引会话中已加载对象的键。如果是CompositeId,则将类本身用作id。